New Obama ad makes appeal to middle class before convention

AMES, IA - AUGUST 28: U.S. President Barrack Obama speaks during a campaign event at Iowa State University on August 28, 2012 in Ames, Iowa. Iowa State was the first stop on a three campus college tour where Obama was addressing mainly students about education finance and healthcare. (Photo by David Greedy/Getty Images)
(2012 Getty Images)

The ad says Romney wants to extend tax cuts for millionaires at the expense of middle-income earners.

Romney has called for an extension of tax cuts first approved by George W. Bush for all income earners. Obama wants to let the cuts expire at the end of the year for families making more than $250,000 a year.

The ad says Romney doesn't see the "heavy load" the middle class is carrying.

The new spot is airing as Democrats open their party convention, where they'll focus on Obama's economic plans for the middle class.

The ad is running in Colorado, Iowa, New Hampshire, Nevada, Ohio and Virginia, key battleground states.